Ashfall forecasts: Model output

Mathematical models developed by the USGS forecast how a volcanic ash plume will interact with wind and  where ash will fall out and accumulate on the ground. AVO runs these models when a volcano is restless by assuming a reasonable hypothetical eruption, to provide a pre-eruptive forecast of areas likely to be affected. During an ongoing eruption, AVO will update the forecast with actual observations (eruption start time and duration, plume height) as they become available. Click on the graphic to learn more.

THESE PRODUCTS MAY NOT BE CURRENT.
During an actual eruption, see National Weather Service forecasts of airborne ash hazard to aircraft (SIGMETS:https://weather.gov/aawu/and Volcanic Ash Advisories:https://weather.gov/vaac) as well as forecasts of ash fall:https://weather.gov/afc.

Ash Cloud Forecast